Bark Collar [New Version] Humanely Stops Barking with Sound and Vibration. No Shock, Harmless and Humane. Small Dog Bark Collar, Medium Dog Bark Collar Petiner Bark collar sends harmless static shock to the dog whenever it barks Adjustable nylon collar senses vibration in dog's throat during barking Increase the robustness and stability,Lightweight receiver perfect for toy or small breeds Includes receiver, operating manual and replaceable 6-volt battery Generally recommend for 18-120lbs dogs.